Abstract:
Multiple energy sources, such as a laser and electrical current, are employed, in close coordination, spatially and temporally, to clean a sample, vaporize its material and excite vapor atoms for the purpose of atomic emission spectroscopy. These methods permit better monitoring and control of the individual processes in real time, lead to higher consistency and higher quality optical emission spectra, and enhance the measurements of non-conducting solids, liquids and gases. Additionally, a portable instrument is provided with both laser source and spectrometer optically coupled to a hand-holdable unit.
Abstract:
An optical apparatus for plasma includes a light collection lens provided to receive optical emission spectrum from plasma, a first aperture stop disposed between the light collection lens and the plasma to block out-focused light, a second aperture stop disposed between the light collection lens and an imaging area of the light collection lens to block in-focused light, and a pinhole disposed at the imaging area of the light collection lens to limit depth of focus.
Abstract:
A device for mass spectroscopy comprising a chamber configured to provide an atomization source, a boost device configured to provide radio frequency energy to the chamber, and a mass analyzer in fluid communication with the chamber and configured to separate species based on mass-to-charge ratios is disclosed. In certain examples, a boost device may be used with a flame or plasma to provide additional energy to a flame or plasma to enhance desolvation, atomization, and/or ionization.
Abstract:
An atomic analyzer includes a plasma generator, in which a discharge gas is fed in a micro gap between a pair of electrodes to generate nonequilibrium atmospheric pressure plasma, a bias voltage controller that includes a plasma-leading electrode for leading the nonequilibrium atmospheric pressure plasma generated by the plasma generator to an object to be irradiated, the object to be irradiated with the nonequilibrium atmospheric pressure plasma is placed on the plasma-leading electrode, a bias voltage is applied between the plasma-leading electrode and the electrodes of the plasma generator to irradiate the object with the nonequilibrium atmospheric pressure plasma, and a spectrometer that analyzes atoms spectroscopically from light emitted from atomized generated by atomizing a substance composing the object to be irradiated by the nonequilibrium atmospheric pressure plasma irradiation or from light absorbed by the atomized atoms.
Abstract:
A gas imaging system for remotely detecting gas emissions by passive images of infrared radiation includes an optical system having a field of view. The optical system has a lens, an optical filter system for filtering light passed through the lens, and a photosensitive array located at the focal plane of the optical system to produce multi-spectral infrared image data of a scene under observation. A multi-spectral image processing system is configured for processing the image data produced by the photosensitive array to detect hazardous gas emissions and to discriminate against infrared radiation emitted by false alarm sources. Some embodiments may be configured for flame detection. Other embodiments may be configured for gas and flame detection.
Abstract:
Provided is a laser ablation spectroscopy apparatus and method. A pulse laser is focused on the sample site to generate a plasma plume during a laser ablation process. The plasma plume is detected with a spectrometer and an intensified charge coupled device. A sample of material is coupled to a stage movable in the x, y and z directions using an array of x-y-z motors. A change in the height of the sample is detected using a triangulation sensor. The apparatus includes a system computer for synchronizing the movement of the stage in the x, y and z direction during the laser ablation process. The method includes a protocol of generating one or more laser ablations per sample site. The spectral data of the total number of laser ablations for each sample site are averaged together. The protocol includes laser ablating additional sample sites and averaging the spectral data of the total number of sample sites.
Abstract:
The invention relates to a method for the qualitative and quantitative analysis of samples by optical emission spectroscopy with laser excitation (18), using a database created on single-element aqueous solutions all having the same pure element concentration, this database containing, for each element, the wavelengths of the emission lines and their respective intensities.
Abstract:
A two-chamber electron impact emission sensor effective for monitoring vapor flux of materials in the presence of interfering species is described. The sensor includes two independent electron excitation regions and one photodetector for monitoring emission from excited species from both chambers. Copper vapor flux from an evaporation source was accurately measured in the presence of interfering H2O vapor, and Ga vapor flux from an evaporation source was accurately monitored in the presence of interfering CO2 gas. The invention permits deposition rates to be monitored using electron-impact emission spectroscopy with significantly improved accuracy in the presence of interfering gases at high partial pressures.
Abstract:
A device for sustaining a plasma in a torch is provided. In certain examples, the device comprises a first electrode configured to couple to a power source and constructed and arranged to provide a loop current along a radial plane of the torch. In some examples, the radial plane of the torch is substantially perpendicular to a longitudinal axis of the torch.
Abstract:
[Object] To identify and quantitate an atom of a solid element contained in sludge, waste fluid, or soil.[Solving Means] An atomic analyzer includes a plasma generator 10 in which a discharge gas is fed in a micro gap between a pair of electrodes to generate nonequilibrium atmospheric pressure plasma; a bias voltage controller that includes a plasma-leading electrode 21 for leading the nonequilibrium atmospheric pressure plasma generated by the plasma generator to an object to be irradiated 22, the object to be irradiated with the nonequilibrium atmospheric pressure plasma being placed on the plasma-leading electrode, a bias voltage being applied between the plasma-leading electrode and the electrodes of the plasma generator to irradiate the object with the nonequilibrium atmospheric pressure plasma; and a spectrometer that atomizes a substance composing the object to be irradiated by the nonequilibrium atmospheric pressure plasma irradiation to analyze the atoms by absorption spectrometry.